Hi MM, I used a 'burst' method of driving 200KHz and 30KHz transducers. The transducer pulse generator was from a square wave osc, tunable over a narrow range in order to get the optimum power out from the transducer. The pulse or burst width generator was adjustable from 100uSec thru 10mSec, this enabled a level of power control in the acoustic pulse. The transducer driver stage was a NPN power transistor driving a 1:3 or 1:5 transformer at 30KHz or 200KHz respectively, supply voltage 12V or 24V depending upon the required acoustic power. My product applications were for hydro-graphic depth echo sounders, working in water depths of 0.5mtr upto 400mres.
E Is you application bio-diesel.? Hi Eric, Isn't the number of cycles (burst) of 40khz determined by the length of the ON pulse? A 20ms pulse will have more cycles that a 2ms one (10 times more).
An ultrasonic transducer driving circuit configured to supply an output current and/or. The buffer amplifier includes a first push-pull circuit having a first transistor. A piezo transducer behaves somewhat as a capacitor. As your driver transistor allows only a single polarity intermittent current to flow in the transducer (with or without D1) there is no oscillation as would be required for an ultrasonic output. The transducer's capacitance simply charges up to about the supply voltage.
The size of the Burst is directly related to the duty cycle. In order to increase the burst time, we need an amplifier that will take more power. Currently I can't get past a duty cycle of 1% without smoking the heatsinked Fet. Programma dlya rascheta korpusa sabvufera na russkom yazike mp3. EG: 5ms ON and 500mx OFF. As I mentioned before, I dip all transducers to find their exact resonant TX frequencies and their band pass. Then I program the CPU to change frequency over the band pass.
If the BP is say 2khz wide, I will step the frequency up by 100hz every few seconds. That way I send multiple bursts to 20 different frequency locations, of which a few should be more effective in ringing the wafer. What do you think? I built a cat scarer at my last house. I didn't bother with trying to tune to the ultrasonic horn I had. I drove the secondary of a toroidal mains transformer using a low voltage drive at ~41KHz and used the primary straight across the piezo horn. Maybe not the most efficient, but it worked effectively and gave quite a nip when touched.
What surprised me most was the frequency response of a 6.0.6-240VAC cheapo toroid was at such a frequency. It solved my cat problem BTW with me having to suffer the loud click when the device first powered the horn. I could have resolved this with a bit of signal/startup logic but never bothered in the end.
Hi MM, I used a 'burst' method of driving 200KHz and 30KHz transducers. The transducer pulse generator was from a square wave osc, tunable over a narrow range in order to get the optimum power out from the transducer. The pulse or burst width generator was adjustable from 100uSec thru 10mSec, this enabled a level of power control in the acoustic pulse. The transducer driver stage was a NPN power transistor driving a 1:3 or 1:5 transformer at 30KHz or 200KHz respectively, supply voltage 12V or 24V depending upon the required acoustic power. My product applications were for hydro-graphic depth echo sounders, working in water depths of 0.5mtr upto 400mres.
E Is you application bio-diesel.? Hi Eric, Isn't the number of cycles (burst) of 40khz determined by the length of the ON pulse? A 20ms pulse will have more cycles that a 2ms one (10 times more).
An ultrasonic transducer driving circuit configured to supply an output current and/or. The buffer amplifier includes a first push-pull circuit having a first transistor. A piezo transducer behaves somewhat as a capacitor. As your driver transistor allows only a single polarity intermittent current to flow in the transducer (with or without D1) there is no oscillation as would be required for an ultrasonic output. The transducer's capacitance simply charges up to about the supply voltage.
The size of the Burst is directly related to the duty cycle. In order to increase the burst time, we need an amplifier that will take more power. Currently I can't get past a duty cycle of 1% without smoking the heatsinked Fet. Programma dlya rascheta korpusa sabvufera na russkom yazike mp3. EG: 5ms ON and 500mx OFF. As I mentioned before, I dip all transducers to find their exact resonant TX frequencies and their band pass. Then I program the CPU to change frequency over the band pass.
If the BP is say 2khz wide, I will step the frequency up by 100hz every few seconds. That way I send multiple bursts to 20 different frequency locations, of which a few should be more effective in ringing the wafer. What do you think? I built a cat scarer at my last house. I didn't bother with trying to tune to the ultrasonic horn I had. I drove the secondary of a toroidal mains transformer using a low voltage drive at ~41KHz and used the primary straight across the piezo horn. Maybe not the most efficient, but it worked effectively and gave quite a nip when touched.
What surprised me most was the frequency response of a 6.0.6-240VAC cheapo toroid was at such a frequency. It solved my cat problem BTW with me having to suffer the loud click when the device first powered the horn. I could have resolved this with a bit of signal/startup logic but never bothered in the end.
...">Ultrasonic Transducer Driver Amplifier Circuit(22.11.2018)Hi MM, I used a 'burst' method of driving 200KHz and 30KHz transducers. The transducer pulse generator was from a square wave osc, tunable over a narrow range in order to get the optimum power out from the transducer. The pulse or burst width generator was adjustable from 100uSec thru 10mSec, this enabled a level of power control in the acoustic pulse. The transducer driver stage was a NPN power transistor driving a 1:3 or 1:5 transformer at 30KHz or 200KHz respectively, supply voltage 12V or 24V depending upon the required acoustic power. My product applications were for hydro-graphic depth echo sounders, working in water depths of 0.5mtr upto 400mres.
E Is you application bio-diesel.? Hi Eric, Isn't the number of cycles (burst) of 40khz determined by the length of the ON pulse? A 20ms pulse will have more cycles that a 2ms one (10 times more).
An ultrasonic transducer driving circuit configured to supply an output current and/or. The buffer amplifier includes a first push-pull circuit having a first transistor. A piezo transducer behaves somewhat as a capacitor. As your driver transistor allows only a single polarity intermittent current to flow in the transducer (with or without D1) there is no oscillation as would be required for an ultrasonic output. The transducer's capacitance simply charges up to about the supply voltage.
The size of the Burst is directly related to the duty cycle. In order to increase the burst time, we need an amplifier that will take more power. Currently I can't get past a duty cycle of 1% without smoking the heatsinked Fet. Programma dlya rascheta korpusa sabvufera na russkom yazike mp3. EG: 5ms ON and 500mx OFF. As I mentioned before, I dip all transducers to find their exact resonant TX frequencies and their band pass. Then I program the CPU to change frequency over the band pass.
If the BP is say 2khz wide, I will step the frequency up by 100hz every few seconds. That way I send multiple bursts to 20 different frequency locations, of which a few should be more effective in ringing the wafer. What do you think? I built a cat scarer at my last house. I didn't bother with trying to tune to the ultrasonic horn I had. I drove the secondary of a toroidal mains transformer using a low voltage drive at ~41KHz and used the primary straight across the piezo horn. Maybe not the most efficient, but it worked effectively and gave quite a nip when touched.
What surprised me most was the frequency response of a 6.0.6-240VAC cheapo toroid was at such a frequency. It solved my cat problem BTW with me having to suffer the loud click when the device first powered the horn. I could have resolved this with a bit of signal/startup logic but never bothered in the end.
...">Ultrasonic Transducer Driver Amplifier Circuit(22.11.2018)